已知X/2=y/3=z/4,试求x+y-z/x+y+z的值 (这是初二分式) 要过程
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已知X/2=y/3=z/4,试求x+y-z/x+y+z的值 (这是初二分式) 要过程
已知X/2=y/3=z/4,试求x+y-z/x+y+z的值 (这是初二分式) 要过程
已知X/2=y/3=z/4,试求x+y-z/x+y+z的值 (这是初二分式) 要过程
设X/2=y/3=z/4=k
x=2k,y=3k,z=4k
x+y-z/x+y+z
=2k+3k-4k/2k+3k+4k
=k/9k
=1/9
用等式性质,原等式=(x+y+z)/(2+3+4)=(x+y-z)/(2+3-4),则=1/9
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